Personally, when I’m davening Shmone Esrei and someone is standing waiting to for me to finish so that he can pass it is veruy annoying and takes away all possible kavanah. It would be better for him just to pass me so that I can daven the rest with kavana.
Same for the guy davening in front of me and finishes Shmonei Esreh before me, every 15 seconds turning around… just back up and let me finish at my own pace.